/// <summary>
/// Creates an empty <see cref="TgaImage"/> with the given specification.
/// </summary>
/// <param name="width">The width in pixels.</param>
/// <param name="height">The height in pixels.</param>
/// <param name="format">The <see cref="TgaFormat"/> to create the image in.</param>
public TgaImage(int width, int height, TgaFormat format)
{
if (width < 0 || width > ushort.MaxValue)
{
throw new ArgumentOutOfRangeException(nameof(width));
}
if (height < 0 || height > ushort.MaxValue)
{
throw new ArgumentOutOfRangeException(nameof(height));
}
header = new TgaHeader
{
ImageType = 2,
ColorMapSpec = new TgaColorMapSpec {
},
ImageSpec = new TgaImageSpec
{
ImageWidth = (ushort)width,
ImageHeight = (ushort)height,
BitsPerPixel = 16,
AlphaWidthAndDirection = (byte)(format == TgaFormat.Argb4 ? 36 : 32),
}
};
data = new TgaImageData
{
ColorMapData = new byte[0],
ImageId = new byte[0],
PixelData = new byte[width * height * 2],
};
}
public static TgaImageData Deserialize(TgaHeader header, BinaryReader reader)
{
var colorMapByteLen = header.ColorMapSpec.ColorMapLength * header.ColorMapSpec.ColorMapEntrySize;
var imageByteLen = (int)Math.Ceiling(header.ImageSpec.ImageWidth * header.ImageSpec.ImageHeight * header.ImageSpec.BitsPerPixel / 8.0);
return(new TgaImageData
{
ImageId = reader.ReadBytes(header.IdLength),
ColorMapData = reader.ReadBytes(colorMapByteLen),
PixelData = reader.ReadBytes(imageByteLen),
});
}
/// <summary>
/// Parses a TGA format image from bytes.
/// </summary>
/// <param name="reader">The binary reader to read the bytes from.</param>
/// <returns>The parsed <see cref="TgaImage">.</returns>
public static TgaImage FromBytes(BinaryReader reader)
{
if (reader == null)
{
throw new ArgumentNullException(nameof(reader));
}
var header = TgaHeader.Deserialize(reader);
var img = TgaImageData.Deserialize(header, reader);
return(new TgaImage(header, img));
}
private TgaImage(TgaHeader header, TgaImageData data)
{
this.header = header;
this.data = data;
}